Paloniemi Hanna, Aäritalo Timo, Laiho Taina, Liuke Hanna, Kocharova Natalia, Haapakka Keijo, Terzi Fabio, Seeber Renato, Lukkari Jukka
Department of Chemistry, University of Turku, 20014 Turku, Finland.
J Phys Chem B. 2005 May 12;109(18):8634-42. doi: 10.1021/jp0443097.
HiPco single-wall carbon nanotubes (SWNTs) have been noncovalently modified with ionic pyrene and naphthalene derivatives to prepare water-soluble SWNT polyelectrolytes (SWNT-PEs), which are analogous to polyanions and polycations. The modified nanotubes have been characterized with UV-vis-NIR, fluorescence, Raman and X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). The nanotube-adsorbate interactions consist of pi-pi stacking interactions between the aromatic core of the adsorbate and the nanotube surface and specific contributions because of the substituents. The interaction between nanotubes and adsorbates also involves charge transfer from adsorbates to SWNTs, and with naphthalene sulfonates the role of a free amino group was important. The ionic surface charge density of the modified SWNTs is constant and probably controlled by electrostatic repulsion between like charges. The linear ionic charge density of the modified SWNTs is similar to that of common highly charged polyelectrolytes.
HiPco单壁碳纳米管（SWNTs）已用离子芘和萘衍生物进行非共价修饰，以制备水溶性SWNT聚电解质（SWNT-PEs），它们类似于聚阴离子和聚阳离子。已通过紫外可见近红外光谱、荧光光谱、拉曼光谱、X射线光电子能谱（XPS）和透射电子显微镜（TEM）对改性纳米管进行了表征。纳米管与吸附物之间的相互作用包括吸附物的芳香核与纳米管表面之间的π-π堆积相互作用以及由于取代基产生的特定贡献。纳米管与吸附物之间的相互作用还涉及从吸附物到SWNTs的电荷转移，对于萘磺酸盐而言，游离氨基的作用很重要。改性SWNTs的离子表面电荷密度是恒定的，可能受同性电荷之间的静电排斥控制。改性SWNTs的线性离子电荷密度与常见的高电荷聚电解质相似。
